Storage system and its access control method

US20050097274A1Inactive Publication Date: 2005-05-05NEC CORP
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
NEC CORP
Publication Date
2005-05-05
Estimated Expiration
Not applicable · inactive patent

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Abstract

A storage system configuring a logical storage device by dividing an area on a physical storage space formed by a group of several physical storage devices by the unit of physical block having a certain block length and by assigning the physical storage space in every physical block, comprises a logical storage control table which records identification information indicating whether a physical block is assigned to data or operation is bound to data created from a predetermined data arrangement pattern in every area on the logical storage device, and a data writing unit which, upon receipt of a request of writing data into an area of the logical storage device, when a data arrangement pattern of the writing request agrees with a previously-registered data arrangement pattern, records the identification information of the same data arrangement pattern into the logical storage control table correspondingly to the writing-requested area and abandons the writing request data.
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Description

BACKGROUNDS OF THE INVENTION

[0001] b 1. Field of the Invention

[0002] The present invention relates to a storage system configuring a logical storage device by dividing the area on a physical storage space formed by a group of several physical storage devices by the unit of physical block having a certain block length and by assigning the physical storage space in every physical block, and more particularly to a storage system and its access control method for improving efficiency of assignment of physical storage devices.

[0003] 2. Description of the Related Art

[0004] Heretofore, there has been such a storage system as forming a logical storage device by a group of several physical storage devices, like a disk array device represented by RAID (Redundant Arrays of Inexpensive / Independent Disks). Data to be stored in the logical storage device on this storage system will be dispersed and stored in each storage area on several physical storage devices.

[0005] Holding a table for bri...

Claims

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